RJ,
You can discount West Hills as it was a very hill course, more elevation change than ANGC.
It survived with low play rates until the early 50s when it lost best use status.
Wildwood was just as hilly and was 20 miles from town. It went fallow in the late 50s and was reconstituted.
Ruby's -I have no idea. It doesn't appear on a 1937 Pittmon directory list.
City View- Remained in some form through the 1970s as Top O Scott. Hilly
Monaugh Lea - Same as Ruby's
Mt Hood - 50 miles and two hours away.
Meadowbrook - Renamed Colwood, still there but not listed as a course in 1937.
I think the muni stats do show the loss of rounds played in the industry. Even in the 40s the Portland airport was way pout in the farmland, so land value and construction costs of new golf courses were reasonable and everyone was chasing the golden age bubble and Bobby Jones was a news darling. As far as Rose City is concerned, it was maybe the second best track among the non-privates, but I never saw Inverness or Peninsula.